c²-d²-7d-7c=(c-d)x(c+d)-7(d+c)=(c+d)x(c-d-7)
[tex]c^{2} -d^{2} -7d-7c=(c-d)*(c+d)-7(d+c)=(c+d)*(c-d-7)[/tex]
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c²-d²-7d-7c=(c-d)x(c+d)-7(d+c)=(c+d)x(c-d-7)
[tex]c^{2} -d^{2} -7d-7c=(c-d)*(c+d)-7(d+c)=(c+d)*(c-d-7)[/tex]